meta-networking: standardize SECTION values

SECTION has been used inconsistently throughout the recipes in this layer.
Convert them to all use the same convention.

Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/recipes-protocols/pptp-linux/pptp-linux_1.7.2.bb

@@ -5,7 +5,7 @@ DESCRIPTION = "PPTP Client is a Linux, FreeBSD, NetBSD \
     Virtual Private Network (VPN) as used by employers and some \
     cable and ADSL internet service providers."
 HOMEPAGE = "http://pptpclient.sourceforge.net"
-SECTION = "network"
+SECTION = "net"
 LICENSE = "GPLv2+"
 LIC_FILES_CHKSUM = "file://COPYING;md5=8ca43cbc842c2336e835926c2166c28b"